Ornithologists say the chirping of birds at daybreak is part of their mating ritual. They tell me that increasing daylight, especially in the spring and early summer, triggers the mating instinct in ...

I was recently creeping through a clearing of downed trees in a wooded Brooklyn park with my iPhone in hand. Birds were singing everywhere, but through the din, I was recording a peculiar song: It was ...

Birds do it and so do doughnut-shaped fusion facilities called "tokamaks." But tokamak chirping-- a rapidly changing frequency wave that can be far above what the human ear can detect -- is hardly ...